Hey there, just picked up my jeep from the dealership after a PVC change / throttle body/iac valve cleanup... As I was leaving I asked one of the managers there what this rumbling gargling noise was that was coming underneath the jeep when I step on the gas... He said it was most probably an exhaust manifold tear/hole....

What does that mean now? I hope it's not an expensive repair... I was planning on buying an cat back exhaust system in the spring...